Dental engine



(No Model.)

F. A. DAMON.

DENTAL ENGINE.

No. 481,164. Patented Aug. 23, 1892.

rrnn STATES ATENT Orrrca FRANK ARTHUR DAMON, OF FITCI-IBURG,MASSACHUSETTS.

' DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 481,164, dated August23, 1892.

Application filed July 16,1891. Serial No. 399,703. (No model.)

To all whom it may concern:

Be it known that I, FRANK ARTHUR DA- MON, a citizen of the UnitedStates, residing at Fitchburg, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inDental Engines; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the figures of ref erencemarked thereon, which form a part of this specification.

My invention is in the nature of a dental engine, and has for its objectto furnish an improved machine of this class Which shall be easilyadjustable to greater or less speed and readily reversed or stopped andshall be simple in construction and not liable to get out of order.

lVith these objects in View my invention consists in the improvedconstruction, arrangement, and combination of parts, as hereinafterfully described, and afterward specifically pointed out in the subjoinedclaims.

In the accompanying drawings, illustrating my invention, in the severalfigures of which like parts are similarly designated, Figure 1 is a viewin side elevation of a dental engine constructed in accordance with myinvention, the outline of the operating-chair being shown in dottedlines. Fig. 2 is a view of the same in rear elevation, the chair beingalso shown in outline in dotted lines. Fig. 3 is a top plan view of theengine, the chair being omitted.

1 is the base which supports the main column 2 of the engine, saidcolumn being in two parts joined together at 3 by a swiveljoint topermit the upper part 4, which car ries the operative parts, to beturned upon the lower or main portion 2.

Rigidly secured to or preferably cast integral with the upper part 4 ofthe column is an arm or bracket 5, to which another or second arm 6 ispivoted at 7. This pivoted arm is the bearing in which a friction-wheel8 is journaled, said friction-wheel being applied in any suitable mannerto the usual powertransmitting shaft arranged in the shaft-tube 9. Byreason of the mounting of the arm or hearing 6 upon the pivot 7 there isa vertical movement of the shaft and shaft-tube permissible, and arotary movement in a horizontal plane being permitted by the swiveljoint3 in the column the friction-wheel and its shaft are given a universaladjustment. The vertical adjustment of these parts is controlled bymeans of a pawl 10 on shaft-tube 9, which engages a curved rack 11,bolted or otherwise rigidly secured to the upper partof the column.

The friction-wheel 8 is provided with a ru bber tire 12, which is incontact with the side of a larger friction-wheel 13, and this wheel 13is mounted upon the horizontally-projecting portion 14 of an arm 15, themain body of which arm extends downward and is pivoted upon a horizontalarm or pin 16, projecting horizontally from the upper part 4 of thecolumn, the shaft of wheel 13 being at right angles to that of the wheel8. The larger or driving wheel 13 is driven from a suitable motor bymeans of a band 17, said motor being located suitably upon the floor,and while such motor may be of any desirable class I prefer theordinarywater-motor,so well known for analogous purposes.

When it is desired that the motion of the driven wheel 8 be retarded,the driving wheel or pulley 13 is adjusted so that the wheel 8 will haveits bearing nearer to the center of the wheel 13, and to accelerate themotion of the wheel Sits relation with wheel 13 is so changed (by movingwheel 13) that it shallbear upon wheel 13 nearer to its circumference.To stop the small wheel and of course the tool which it carries, thewheel 13 is moved so that wheel 8 will bear upon it at its center, and,if desired, a small portion of wheel 13 may be removed at its center, asindicated by the dotted lines a in Figs. 1 and 2, so that there will beno bearing at this point. To reverse the motion of wheel 8, it is onlynecessary to so move the wheel 13 that the point of contact of wheel 8with it shallbe changed from one side of the center of wheel 13 to theother. To eifect these adjustments, I have provided the followingmechanisms, under full control of the operator and actuated by a treadleat one side and to the rear of the chair: At the lower end of arm 15 isconnected a horizontal link or rod 18, which passes alongside of and toa point in line with i 'l id t the rear of the chair, the chair beingshown in outline by dotted lines at 19. At this point the link or red 18is pivotally connected with the upper end of a crank-arm 20, projectingupward from a shaft 21, j ournaled in suitable bearings 22 011 thefloor, or it may be attached to the legs of the chair. This shaft passesunder or to the rear of the rear of the chair to its opposite side (therigh-hand side) and is there provided with a treadle 23, by means ofwhich it may be turned. The operator, standing on the righthand side ofthe chair, with his foot upon the treadle 23, thus has full control ofthe engine, which is located on the left-hand side of the chair and infront thereof.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. A dental engine provided with a toolshaft, a frictiondriven wheelthereon, a pivoted arm, and a driving friction-wheel arranged on one endof said arm and by it adjustable with relation to the driven wheel tobring the point of contact between the two wheels to opposite sides ofthe center of the driving-wheel to change the direction of mo tion andcapable of having its centerbrought opposite the driven wheel to stopthe toolshaft, the parts being combined and operating as set forth.

2. The combination, in a dental engine, of the tool-shaft,afriction-wheel mounted thereon, a second friction wheel having adepressed center, a pivoted arm carrying the second frictiomwheel, thefrictional contact being between the circumference of the first and theside surface of the second wheel, and means to vibrate said arm, as setforth.

The combination, in a dental engine, of a tool-shaft, a friction-wheelthereon, a second friction-wheel, with whose side surface thecircumference of the first wheel engages, a pivoted arm upon which thesecond wheel is mounted, a treadle, and connections between the pivotedarm and the theadle, whereby the position of the, second wheel withrelation to the first is controlled from the treadle, as and for thepurpose set forth.

at. In combination, the column consisting of the upper and lower partsconnected by a swivel-joint, the friction-wheel carrying the tool-shaftand pivotally mounted on the upper part of the column, the sidefriction-wheel driven from a suitable motor, the lever upon which saidwheel is mounted, also pivoted to the upper part of the column, thehorizontal bar connected to the pivoted arm at one end, and thetreadle-shaft having crank-arm, to which said horizontal bar isconnected at its opposite end, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK ARTHUR DAMON.

\Vitnesses:

NELLIE A. S'roNE, Amen L. Queen.

